Roof Replacement Cost Calculator UK

By CalculatorBolt Team | Published: | Updated: | Reviewed by: Construction & DIY Editor

Estimate the cost to replace a roof in the UK. Enter roof size, type, and material. Get total cost, cost per m², and labour/material breakdown. Informational only—consult a local roofer.

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Approximate area of your roof
Must be > 0
Type of roof structure
Height affects access and safety costs
Must be > 0
Material choice affects durability and cost
Affects additional repair costs

Cost Estimate

Total Estimated Cost

£0

Cost per m²

£0

Component Cost

Preset Roofs

Export/Import

How it works

Total Cost = (Material Cost/m² + Labour Cost/m²) × Roof Size × Multipliers. We use standard UK rates for different roof types and materials, then adjust for the number of stories (affects access and safety) and current roof condition (affects repair needs).

Stories Multiplier: 1.0 (1 story), 1.2 (2 stories), 1.5 (3+ stories)
Condition Multiplier: 1.0 (Good), 1.1 (Fair), 1.2 (Poor)
Total Material Cost = Roof Size × Material Cost/m² × Multipliers
Total Labour Cost = Roof Size × Labour Cost/m² × Multipliers
Total Cost = Material Cost + Labour Cost

Inputs explained

Roof Size (m²)
The approximate area of your roof. Measure length × width or consult your building plans.
Roof Type
Flat roofs are generally cheaper than pitched roofs but may have different material options.
Number of Stories
Height affects access difficulty, scaffolding needs, and safety costs.
Roof Material
Material choice affects cost, durability, and appearance. Slate is premium and long-lasting, while tiles and shingles are more economical.
Current Roof Condition
Poor condition may require additional structural repairs, increasing the overall cost.

Example

Scenario: Detached House with pitched slate roof

  • Roof Size: 150 m²
  • Roof Type: Pitched
  • Material: Slate (£80/m² material, £50/m² labour)
  • Stories: 2 (multiplier 1.2)
  • Condition: Good (multiplier 1.0)

Calculation:

  • Material Cost: 150 × £80 × 1.2 × 1.0 = £14,400
  • Labour Cost: 150 × £50 × 1.2 × 1.0 = £9,000
  • Total Cost: £14,400 + £9,000 = £23,400

Tips & notes

  • Flat roofs are generally cheaper to install than pitched roofs but may have a shorter lifespan.
  • Slate is a premium material with a lifespan of 80-100+ years, making it cost-effective long-term.
  • Always get multiple quotes from reputable, registered roofers before committing to work.
  • Check if you need planning permission, especially for material changes or in conservation areas.
  • Consider the time of year—spring and autumn are typically best for roofing work in the UK.
  • Factor in additional costs like scaffolding, skip hire, and disposal of old materials.

FAQs

It varies, but a typical range is £5,000 to £15,000 for a standard 3-bed house. Larger detached houses with premium materials like slate can cost £15,000 to £25,000+.

Asphalt shingles or metal roofing are often the cheapest options, typically costing £40-60 per square meter including materials and labor.

Usually 1-2 weeks, depending on the size of the roof, weather conditions, and complexity of the project.

Usually not for like-for-like replacement. However, you may need permission if changing the roof type, height, or materials in a conservation area. Check with your local authority.

Main factors include roof size, type (flat vs pitched), material choice, number of stories, current roof condition, access difficulty, and location in the UK.

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